RE: [Intel-wired-lan] [PATCH 1/2] igb: Teardown SR-IOV before unregister_netdev()

From: Brown, Aaron F
Date: Mon Aug 10 2015 - 22:12:06 EST

> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@xxxxxxxxxxxxxxxx] On
> Behalf Of Alex Williamson
> Sent: Monday, July 27, 2015 4:19 PM
> To: intel-wired-lan@xxxxxxxxxxxxxxxx; Kirsher, Jeffrey T
> Cc: netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: [Intel-wired-lan] [PATCH 1/2] igb: Teardown SR-IOV before
> unregister_netdev()
> When the .remove() callback for a PF is called, SR-IOV support for the
> device is disabled, which requires unbinding and removing the VFs.
> The VFs may be in-use either by the host kernel or userspace, such as
> assigned to a VM through vfio-pci. In this latter case, the VFs may
> be removed either by shutting down the VM or hot-unplugging the
> devices from the VM. Unfortunately in the case of a Windows 2012 R2
> guest, hot-unplug is broken due to the ordering of the PF driver
> teardown. Disabling SR-IOV prior to unregister_netdev() avoids this
> issue.
> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
> ---
> drivers/net/ethernet/intel/igb/igb_main.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)

Tested-by: Aaron Brown <aaron.f.brown@xxxxxxxxx>
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